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US 10,450,448 B2Granted
Sealing compounds with scavenger materials of small particle size
AssigneeActega DS GmbH
InventorsWilliam David Coulter, Rüdiger Wittenberg
Life of this patent
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Abstract
PVC-free polymer compound for producing seals containing scavengers for screw caps, in particular twist crown corks, characterized in that the Shore A hardness of the polymer compound lies between 50 and 90 and, in a compression set test analogous to ASTM D395-97, Method B, the polymer compound has a compression set of between 30% and 90% after it has been left for 22 hours at 70° C. under a compression of 25%.
Claims19
A polymer-based composition for a PVC-free sealing insert for a twist crown cap, comprising:
- at least one oxygen-scavenging substance;
- at least 20% of at least one block copolymer, wherein the block copolymer is an interpolymer of ethylene and at least one C3-C20 alpha-olefin or a copolymer of ethylene and one C3-C20 alpha-olefin, optionally in combination with other unsaturated monomers;
- wherein the Shore A hardness of the polymer-based composition is between 50 to 90 and the polymer-based composition exhibits a compression set of 30-90% in the compressive deformation test analogous to ASTM D395-97 Method B after 22 hours of storage at 70° C. and a compression of 25%.
Dependencies are inferred from the claim text.